US5041828A - Device for monitoring traffic violating and for recording traffic statistics - Google Patents

Device for monitoring traffic violating and for recording traffic statistics Download PDF

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Publication number
US5041828A
US5041828A US07/230,844 US23084488A US5041828A US 5041828 A US5041828 A US 5041828A US 23084488 A US23084488 A US 23084488A US 5041828 A US5041828 A US 5041828A
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traffic
vehicles
violation
monitoring device
vehicle
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Hans-Gerd Loeven
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Robot Foto and Electronic GmbH and Co KG
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Robot Foto and Electronic GmbH and Co KG
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Assigned to ROBOT FOTO UND ELECTRONIC GMBH U. CO., KG, A CORP. OF GERMANY reassignment ROBOT FOTO UND ELECTRONIC GMBH U. CO., KG, A CORP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LOEVEN, HANS-GERD
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
    • G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules

Definitions

  • the invention relates to a traffic monitoring device comprising
  • a common method of recording is a device for photographic traffic monitoring, by which a photographic picture is taken of the vehicle when violation of a traffic regulation is determined.
  • Traffic light monitoring devices or photographic speed monitoring devices operating with Doppler radar are examples of such devices.
  • a sensor e.g. an induction loop imbedded in the road, supplies a signal when a vehicle enters a road intersection monitored by a traffic light.
  • the traffic light supplies a further signal when the traffic light changes to its stop phase. If the vehicle enters the road intersection during the stop phase, a photographic picture is triggered, which records the vehicle and its licence number. Thus, the vehicle can be identified and the violation can be evidentially recorded. In order to improve the evidential value of the photographic registration, several pictures are usually taken one after the other.
  • Austrian Patent 225,077 already mentioned describes in an embodiment a traffic monitoring device having two sensors fixedly spaced from each other in the road. A camera is released and the vehicle is photographed when the time interval between the passing over of the two sensors drops below a predetermined value. A similar device is described in Austrian Patent 246,617.
  • the speed of a vehicle may be determined by using a Doppler radar.
  • a Doppler radar Such a speed monitoring device is described, for example, in U.S. Pat. No. 2,683,071, Swiss Patent 414,210 or Swiss Patent 470,674.
  • the measured speed is indicated.
  • the vehicle to be monitored is photographed when it exceeds the allowed maximum speed limit and the indication of the actual speed as measured is reflected in the picture (for example German Democratic Patent 66,974).
  • a sequence of speed measuring values can be generated by means of a Doppler radar while vehicles to be monitored pass the radar beam. These speed measuring values are classified in a memory such that a histogram is obtained, i.e. a frequency distribution of these speed measuring values. Conclusions of passing actions or the like can be drawn from such a histogram. It is also possible to infer the type of the passing vehicle from the histogram, i.e. whether the vehicle is a passenger car or a motor lorry.
  • sensors can be imbedded, for example in the form of induction loops, in the road and can detect the number of passing vehicles for statistical purposes.
  • This invention is based on the fact that, in traffic monitoring devices of the type mentioned above, a variety of information about traffic events is obtained, in a way, as "by products", which are of interest for traffic planning and possibly also for the resolution of a single registered violation. However, these types of information are not detected in the previously described devices. These types of information are of particular interest because such traffic monitoring devices usually are placed in focal points of the traffic, where statistical documents about density of traffic, temporal distribution of the traffic and frequency of violation of traffic regulations are of great importance for the traffic planning and control.
  • this object is achieved by an electronic memory adapted to memorize events detected by the device for later evaluation.
  • the density of traffic can be determined as well as the temporal distribution of the density of traffic by means of the clock and the dater which are already present.
  • the number of violations can be related to the density of traffic, or the temporal distribution of the violations can be determined. If the device can distinguish passenger cars from motor lorries, for example, due to a histogram, even this can be statistically evaluated.
  • conclusions of the traffic situation at the moment of a certain violation can be drawn from the statistical evaluation. It can, for example, be determined whether it was heavy traffic or the road was empty in the time interval during which, for example, a monitored vehicle was driven at excessive speed.
  • the electronically memorized data of the determined violations can also be used to make, for example, the formal recording (writing a report) of the violation by means of electronic data processing.
  • the memorized data e.g. date, time, site and speed
  • the evaluating officer just has to register the license number of the vehicle shown in the picture in a written form or printed out by a computer according to the data in its memory.
  • a considerable relief on the police workload from routine writing can be achieved.
  • FIG. 1 is a schematic-perspective illustration of a road intersection controlled by a traffic light having a device for photographic monitoring of this road intersection.
  • FIG. 2 is a block diagram of a device for monitoring a road intersection controlled by a traffic light having a memory for memorizing the detected events.
  • FIG. 3 is a schematic illustration of a speed monitoring device operating with Doppler radar.
  • FIG. 4 is a block diagram of the speed monitoring device of FIG. 3.
  • FIG. 1 is a schematic-perspective illustration of a road intersection 10, which is controlled by a traffic light 12. The other traffic lights of the road intersection are not shown in order to simplify the illustration.
  • a sensor 16 in the form of an induction loop is imbedded in the road carpet of a road 14 joining the road intersection just before the junction with the road intersection 10. The sensor 16 responds if a vehicle 40 passes over.
  • a device 18 for photographic monitoring of the road intersection 10 is arranged in a housing 20, which is arranged on a support 22 shortly spaced from the road intersection 10.
  • the device 18 comprises a signal processing unit 24, a photographic camera 26 controlled by the signal processing unit and a flash light device 28.
  • the signal processing unit 24 receives a sensor signal from the sensor 16 through a line 30 and a stop phase signal from the traffic light 12 through a line 32 when the traffic light changes-over to stop phase.
  • the traffic light 12 comprises a sensor 34, which supplies the stop phase signal.
  • the signal processing unit 24 supplies a releasing signal to a camera releaser 36 when a sensor signal appears during the stop phase. Then the camera releaser 36 releases the camera 26. Then the camera takes a picture of the road intersection 10 with the traffic light 12 showing stop phase and of the vehicle 40 (FIG. 1), which has released the sensor signal.
  • a clock 42 and a dater 44 are provided. These form means 46 for generating time information. The indications of clock 42 and dater 44 are reflected in the picture or registered in another way on the film.
  • the sensor 16 is arranged to prevent additional releases of the camera between these two pictures and also during the time required for feeding film for photographing a next vehicle. Furthermore, the sensor 16 is also arranged to detect a further vehicle, which might enter a road intersection between the time at which these two pictures are taken.
  • a memory 48 is provided in such a device for monitoring a road intersection controlled by a traffic light. This memory is arranged to memorize the events detected by the device for later evaluation for statistical purposes.
  • the sensor 16 is adapted to apply the sensor signals through a line 30. These supply the total number of all vehicles entering the road intersection, regardless as to whether these vehicles enter the road intersection during stop phase and are photographed or not. This information gets lost with usual devices of this type. Furthermore, the memory 48 receives through a line 52 the signals from the signal processing unit 24, which actuates the camera releaser 36. These signals supply a record of the number of detected violations. Finally the memory 48 also receives time information from the clock 42 through a data line 54 and from the dater 44 through a data line 56.
  • the memory can be part of a microprocessor, in which the information is classified so that, for example, the number of the events obtained in predetermined time intervals (pulses on the lines 50 and 52, respectively) are recorded together with the associated time information (time and date).
  • the information thus obtained when the device is in operation can be statistically evaluated later.
  • the density of traffic on the road 14 can be determined as a function of time.
  • the relation of the number of violations to the total number of the vehicles having passed can be determined as well as whether this relation varies with time or with density of traffic. It can also be determined what influence adjustments to the traffic light, for example, prolongation of the "yellow phase", have on the absolute and relative number of the registered violations.
  • the recorded data of different devices of the preset type arranged at traffic focal points in a town supply a regular survey of the traffic events in the town and thus documents for the traffic planning. All this is obtained by using components already present with a relatively small additional expenditure.
  • FIG. 3 shows schematically a speed monitoring device operating with Doppler radar.
  • the device 58 is arranged laterally to the side of a road 60.
  • Numeral 62 designates a vehicle to be monitored.
  • the device 58 comprises a radar antenna 64 emitting a "radar lobe" 66, which is indicated by broken lines.
  • the "radar lobe” illustrates the emitted radiation energy per solid angle as a function of the angle.
  • the device 58 comprises a photographic camera 68, which detects a field of view 70.
  • the signals from the radar antenna 64 are applied to a measuring and evaluation circuit 72.
  • the measuring and evaluation circuit supplies speed measuring values when the vehicle 62 passes through the radar lobe.
  • the camera 68 is released. Therein the camera 68 is released at a moment, in which the vehicle 62 is located substantially in the center of the field of view 70 of the camera 68.
  • a Doppler radar 76 including the radar antenna and the associated transmit-receive device and an evaluation circuit supplies speed measuring values.
  • the speed measuring values are grouped into a histogram, i.e. a distribution of the frequencies of speed measuring values on different speed classes. From this histogram, the occurrence of two vehicles passing by, or the like, can be recognized, which would otherwise lead to causing incorrect measuring values to be applied that might suppress each other and not cause the camera to release. It can also be recognized whether the detected vehicle is a passenger car or a motor lorry. Furthermore, a measuring value of the speed of the monitored vehicle 62 results from the histogram. In FIG.
  • the evaluation "passenger car/motor lorry” is symbolized by a block 80.
  • the determination of the speed from the histogram is illustrated by a block 82.
  • the evaluation "passenger car/motor lorry” actuates a comparator 84 or 86.
  • the measuring value of the speed of the vehicle 62 is applied by block 82 to the comparators and is compared in each of the comparators to a predetermined allowed maximum speed limit of, for example 120 km/h and 80 km/h, respectively.
  • a releasing signal is applied to a camera releaser 88 when the measuring value is higher than 120 km/h or higher than 80 km/h depending on the type of vehicle. Then the camera releaser 88 releases the camera 68. At the same time the time from a clock 90 and the date from a dater are reflected in the picture thus taken.
  • the memory 74 receives the time from the clock 90 through a data line 94 and the date from the dater 92 through a data line 96. Furthermore, the memory 74 receives the measuring value of the speed from block 82 through a data line 98. Furthermore, the memory 74 receives pulses from the evaluation "passenger car/motor lorry" 80 through line 100 or 102, respectively, depending on whether a passenger car or a motor lorry is determined. Finally, the memory 74 receives pulses from the comparator 84 and 86 through line 104 and line 106, respectively, when a vehicle has exceeded the allowed maximum speed limit predetermined for its vehicle type, and a releasing pulse is applied to the camera releaser.
  • a summation of the events and classing according to speeds and/or time can be effected in the memory 74. Also in this device, information about non-photographed vehicles is obtained as "by products" and can be detected and statistically evaluated with relatively small expenditure. Of course, it is not required to memorize all of the information mentioned herein, when not all of the information shall be evaluated.
  • the statistical evaluation can also be important for the judgment of a single detected violation. Thus, exceeding of the allowed maximum speed limit can be more or less serious depending on whether it was heavy traffic or the road was almost empty at the time in question.
  • the electronic memorization of data associated with a detected violation of the traffic regulations can be used to relieve the police in processing the determined violations.
  • the actual data recorded in the electronic memory can be used to write or fill out forms for a report or a notice of payment due by means of a computer. From the memory these forms then receive date, time, site and type of the violation. The police just have to register the licence number of the vehicle from the photographic picture in such a form.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
US07/230,844 1987-08-19 1988-08-10 Device for monitoring traffic violating and for recording traffic statistics Expired - Lifetime US5041828A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3727562 1987-08-19
DE3727562A DE3727562C2 (de) 1987-08-19 1987-08-19 Vorrichtung zur Verkehrsüberwachung

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US5041828A true US5041828A (en) 1991-08-20

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US (1) US5041828A (de)
EP (1) EP0303848B1 (de)
JP (1) JPS6466800A (de)
CA (1) CA1334031C (de)
DD (1) DD295938A5 (de)
DE (2) DE3727562C2 (de)

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DE3727562C2 (de) 1993-12-09
DE3727562A1 (de) 1989-03-02
JPS6466800A (en) 1989-03-13
DD295938A5 (de) 1991-11-14
EP0303848A2 (de) 1989-02-22
DE3865395D1 (de) 1991-11-14
EP0303848B1 (de) 1991-10-09
EP0303848A3 (en) 1989-09-13
CA1334031C (en) 1995-01-17

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